Is CVE-2026-114726 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-114726 being exploited in the wild.

How severe is CVE-2026-114726?

Medium severity, with a CVSS score of 5.8, published 22 October 2026.

Which products and versions are affected?

Roundcube Webmail before 1.6.20, 1.7.x before 1.7.5.

Is there a fix for CVE-2026-114726?

Yes: fixed in 1.6.20, 1.7.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-114726 attacked?

It is attacked over the network.

Am I affected by CVE-2026-114726?

Check whether you run Roundcube Webmail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-114726: Roundcube Webmail mail header injection in Bounce action

CVE-2026-114726 · Severity: medium · CVSS 5.8 · Published 2026-10-22

Roundcube Webmail is a web-based email client used by organizations and individuals to access their email. A flaw in the Bounce (resend) action allows an attacker to inject arbitrary email headers into messages when a user forwards or resends a crafted email, potentially enabling spam, phishing, or credential theft through forged message headers.

Technologies: Roundcube Webmail. Vendors: Roundcube.

Quick answers

Is CVE-2026-114726 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-114726 being exploited in the wild.
How severe is CVE-2026-114726?: Medium severity, with a CVSS score of 5.8, published 22 October 2026.
Which products and versions are affected?: Roundcube Webmail before 1.6.20, 1.7.x before 1.7.5.
Is there a fix for CVE-2026-114726?: Yes: fixed in 1.6.20, 1.7.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-114726 attacked?: It is attacked over the network.
Am I affected by CVE-2026-114726?: Check whether you run Roundcube Webmail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 1.6.20, 1.7.5

Technical details

The vulnerability exists in rcube_mime::decode_address_list(), which fails to strip control characters (CRLF sequences) from decoded display names. When a received email has CRLF characters encoded in the From display-name header, an attacker can inject arbitrary mail headers into the message the user bounces or resends. This is a classic mail header injection attack that requires user interaction (the victim must bounce/resend the malicious message) and can result in forged email headers.

Affected products

Roundcube Webmail before 1.6.20, 1.7.x before 1.7.5

Timeline

2026-10-22: disclosed
2026-10-19: patched

References

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